基于FPGA的智能放大器的研究与实现

Research and Implementation of Intelligent Amplifier Based on FPGA

摘要:

在许多检测仪表的设计和应用中,由于被测信号幅度变化范围大、频带宽,通常采用设置量程变换开关的方式对被测信号进行满量程放大以保证测量的精度,使得硬件结构复杂;为了实现测量的智能化, 设计了一种基于FPGA的智能放大器,可以根据信号的变化相应调整放大器的增益、可对动态范围宽的输入信号用最佳增益对其进行放大,使得放大后输出信号落入设定的窗口范围之内;该放大器已应用于植物种苗磁电场复合诱导繁育控制系统中,运行结果表明,该设计参数精度高,可靠性强,方便实用。

Abstract:

In many design and application of measuring instruments, due to the large variation range of amplitude and frequency bandwidth of measured signal, the range changing switch is set to achieve full range amplification, which ensures the accuracy in measurement. However, the hardware structure is often complex. In order to realize the intelligent measurement, an amplifier is designed based on FPGA (Field Programmable Gate Array). It is able to adjust the gain of the amplifier according to the corresponding changes of signal, and amplify the input signal of wide dynamic range with optimal gain, which makes the output signal fall into the settings window’s range. The amplifier is of high precision parameters, high reliability, convenient and practical, which is proved through experiments and analysis in this paper. 